Control device



Patented Sept. l, 1931 vPATENT orr'lcr.N

Rossrrn n. :POTTER AND MONROE srrAxEsPEABE, oF KALAfMAzoo, MICHIGAN,

ASSIGNORS T SAKESPEARE PRODUCTS COMIANY, OFIKLAMAIZOO, MZICIBIIGAII' y IcoN'rRoL DEVICE y .Application mea october 15, 1927. serial No. 226,428;

The main object of this invention is to provide an improved controldevice for choke valves ofcarburetors.

A further object is to provide an improved j control mechanism of thisclass which is very simple and economical in its parts.

Objects Ipertaining to details and economies of our invention willappear from the description to follow. The invention is delo ned in theclaims. A structure-which is a preferred embodi- `ment of our invention,is illustrated in the accompanying drawings, in which: 1;.

Fig. 1 is a fragmentary side elevation of our improved control device inoperative relation to a carburetor-and mounted upon the partrepresenting an instrument board of a -motor vehicle.

Fig. 2 is a detail view 2o tudinal section on line 2-2 of Fig. 5. p

Fig. 3 is a fragmentary'side view with the control member extended, oneposition being indicated by dotted lines.

Fig. 4 is an enlarged detail section illustrating the manner of securingthe support to the rod housing.

Fig. 5 is 'a cross section on line 5-5 vot ig. 6 is a detail-viewpartially 1n longi tudinal section showing a modified form or embodimentof our invention.

Fig. 7 is adetail view partially in longitudinal section showing anothermodification of our improvements.

Referring to the drawings, 1 represents a carburetor. provided withachoke valve actuating lever 2 which is returned to its normal or openposition by the spring 3. l

4 represents the. instrument 'board of'a motor vehicle. i

The control rod 5 which is normally formed of wire is arranged through asupporting tube or housing 6, the arrangement being commonly designatedas a Bowden tube. The upperl end of this tube 6 is arranged withinand'secl'ired to thebarrel-like support 7 preferably by clamping orupsetting the end 8 of the support thereonsee Fig. 4.

The support 7 in, that is, it has a bore with the outer porpartially inlongi#4 has a shouldered bore there-4 tion 9 of a larger diameterthanthe inner portion 10. This support is externally threaded at 11 andhas a head 12atits outer,- end constituting a nish member and engagingthe inner side, a clamping nut 13 engaging the inner side oftheinstrument board.

The controlrod is provided with a headpiece 14 having a linger piece 15at itsouter end'. The rod is secured to the inner end of thisheadpiece.` The headpiece has an annular groove 16 to receive'ithe U-shaped or split spring 1-7 which frictinally engages the walls of thesmaller diameter of the bore. The friction of the spring 17 with thewalls of smaller diameter ofthe bore is such as to hold l'the headpie'ceagainst the return action of the spring 3, the spring 3, however,returning'the partsto the position in which the friction spring engagesthe reduced walls of the bore so that if the choke be fully closed, thatis, the headpiece pulled out its full length and then released, thespring -3 will return the parts to lretarding position, the

choke then beingonly partially opened. v This permits the choke beingfully closed to start a motor vehicle and the vehicle may be run.

-with the choke partially closed until the' ven-4 gine is suilicientlywarmed to run on the normal supply of gasoline, the choke beingcompletely opened by manually returning the heacpiece.

Iii Fig. 7 thefube 18 is a sona wan tube as distinguished from the tubeformed of coiled wire illustrated'intheother figures,

andthe support member 19 is clamped .upon

the iiared end 2O of the tube 18'. In this em- --bodiment the controlrod 21A has a kink or voi'set 22 therein bringing it into frictionalspring on the headpiece 23.

In the modification shown in Fig. 6, the-I friction spring 24 is mountedin the barrel whichl has an enlargement25 in its boreto receive thespring, the end 26of the barrel being spun down to retain the spring.lThe headpiece 27, in this embodiment, has a reduced portion 28 at itsinner end which moves freely Within the spring, the spring, however,coacting with the largerportion 29 to hold the headpiece With the chokein par-A tially openl position. l.

` We have illustrated and described our improvements in embodimentsWhich We have found very practical. We have not attempted to illustrateor describe certain other l modifications and adaptations Which Wecontemplate as we believe the disclosure made will enable those skilledin the art to embody or 'adapt our improvements as may be desired;

Having thus described ourainvention, what We claim as new and desire tosecure by Letters Patent, is: A l. In a control mechanism, the combina-4tion with the controlled member provided with a return spring, of acontrol rod connectedthereto and' provided with a cylindrical headpiece,asbarrel-like support 1n which said headpiece is reciprocatingly-mounted, said support having a stepped bore with its larger diameter atthe outer end of the support, said headpiece having an annular grooveadjacent its inner end, and a split springmounted in said groove tofrictionallyengage the'walls ofthe smaller diameter 'of said bore butmoving freely in the larger diameter thereof.

2. A control device comprlsing a control `our hands.

7. In a carburetor choke control, the com bination with an elementdesigned to he connectedto the chokevalve, of instrumentalitiespermitting said valve to be fully closed and thereafter to beautomatically partly opened, the said instrumentalities comprising ahousing providing two ranges of movement for said element, a spring forautomatically moving said element through one of `its ranges when thevsaid element is in its fully closed position, and means forfrictionally holding said element in any position to which it ismanually shifted in its other range.

'In Witness whereof we have hereunto set ROSSITER a. POTTER. MONROEsHAKEsPEARE-- l rod provided With a cylindrical headpiece,

a barrel-li ke support in Which said headpiece is reciprocatinglymounted, saidsupport having a stepped bore'with its larger diameter atthe outer end of the support, said .headpiece having an anular grooveadj acentv its inner i end, and a U-sli'aped spring mounted in saidgroove to frictionally' engage the walls of the smaller diameter of saidbore but moving freely in the larger diameter thereof.`

3. A control deviceV comprising-a barrellike support having a steppedbore, the largerl s diameter of the .bore being at the outer end of thesupport, a headpiece reciprocatingly mounted in said supportprovidedwith a finger piece at its outer endand having an annular grooveadjacent its inner end, and a Split spring mounted in said groove tofric- 4 tionally engage the Walls of the smaller diameter of the bore ofthe barrel-like support but to vmovelfreely in the larger Vdiameterthereof.

4. A controlY device comprising a support having a stepped bore, aheadpiece reciprocatingly mounted in said supportl and having a groovetherein, and a spring mounted in said groove to frictionally'engage theWalls of the smaller diameter of said bore.

5. A control'devicecomprising a barrellike support member having astepped bore,

a headpiece reciprocatingly mounted in said support, a return springoperatively associated with saidv headpiece and a friction means'mounted1n one of sadnembers to

